Dual earplug



FIG. 1 is a side elevation view of an earplug showing my design, with the opposite side view and top and bottom views being identical thereto;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof; and,

FIG. 4 is a side elevation view of an earplug of another design, which is identical to that of FIGS. 1-3 except that front (larger) and rear (smaller) halves of the earplugs are of different colors, the drawing being lined so the front half represents the color green and the rear half represents the color yellow. 

The ornamental design for dual earplug, as shown and described. 